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Difficulty: Very hardPediatric Cardiovascular Disorders

Match the following clinical vignettes of neonatal cyanotic heart disease with the most likely underlying congenital cardiac defect.

  • Cyanosis, left axis deviation, and absent R waves in V1 with tall R waves in V6 on ECG, alongside decreased pulmonary vascularity.Tricuspid atresia
  • Severe respiratory distress and cyanosis at birth, prominent parasternal heave, no audible murmur, and severe pulmonary edema on chest radiograph.Obstructed total anomalous pulmonary venous return
  • Mild cyanosis, hyperactive precordium, single S2, bounding peripheral pulses, and a serum calcium level of 6.8 mg/dL.Truncus arteriosus
  • Cyanosis, massive cardiomegaly on chest radiograph, and right atrial enlargement with a short PR interval and slurred QRS upstroke on ECG.Ebstein anomaly

Answer

Tricuspid atresia matches with left axis deviation; obstructed TAPVR matches with severe pulmonary edema and no murmur; truncus arteriosus matches with bounding pulses and hypocalcemia; Ebstein anomaly matches with massive cardiomegaly and Wolff-Parkinson-White syndrome changes.
Each congenital heart defect possesses a unique constellation of findings. Tricuspid atresia is distinctively associated with left ventricular hypertrophy in a cyanotic neonate. Obstructed TAPVR uniquely causes severe pulmonary venous congestion without an audible murmur. Truncus arteriosus combines wide pulse pressures with DiGeorge syndrome features. Ebstein anomaly uniquely presents with extreme right atrial enlargement and Wolff-Parkinson-White syndrome.

Step-by-Step Solution

1
Analyze the ECG findings in cyanotic neonates to distinguish right versus left ventricular dominance.
Left axis deviation and left ventricular hypertrophy in a cyanotic newborn strongly point to tricuspid atresia.
Neonatal ECGs typically show right axis deviation; deviation to the left indicates an underdeveloped right ventricle.
2
Assess the presence or absence of a murmur combined with chest radiograph findings.
Profound cyanosis with pulmonary edema and no murmur indicates a venous obstruction, characteristic of obstructed total anomalous pulmonary venous return (TAPVR).
The lack of a murmur rules out major valvular stenoses or significant septal defects, pointing towards a venous return anomaly.
3
Evaluate systemic findings, such as pulse quality and metabolic derangements.
Bounding pulses combined with a single S2 and hypocalcemia suggest truncus arteriosus.
The common arterial trunk creates a wide pulse pressure, and the embryological neural crest defect associates with thymic and parathyroid hypoplasia (DiGeorge syndrome).
4
Identify characteristic radiographic and electrophysiologic syndromes.
Massive cardiomegaly with pre-excitation (short PR, slurred upstroke) indicates Ebstein anomaly.
Tricuspid valve displacement massively dilates the right atrium, and accessory electrical pathways are a well-known comorbidity.

Key Concept

Diagnostic differentiation of neonatal cyanotic congenital heart defects based on unique physical examination, ECG, and radiographic findings.
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Topics

Pediatric Cardiovascular Disorders

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